If applications are not being launched maybe there's a problem with the installation. You can try to 1. Remove local content (uninstall Mosaico) 2. Reboot your PC 3. Install Mosaico again from Steam.

Unfortunately not all applications allow external software to play with their own size and position, WinAmp may be one of them. In the next version there will be a feature to put any app in ignore list so to avoid these problems. In the meantime you can manually delete those apps from a snapshot.

Mosaico should tabify by default when it is not the active window, to not occupy too much screen space. You can check this in Settings -> General -> "Tabify when not active". If you want to remove this feature just uncheck "Always on top of other windows" setting.

This update has destroyed all functionality. Applications aren't being launched, multi-window applications that use non-standard forms (like Winamp) are rendered non-functional. And the damned thing keeps on top of all my other windows.